Difference in short-term responses to a high-fiber diet in pigs divergently selected for residual feed intake.

摘要: Residual feed intake (RFI), defined as the difference between observed and predicted intakes, has been explored a relevant selection criterion to improve efficiency in growing pigs. Previous studies exploring genetic physiological bases of RFI have focused on pigs fed regular diet. The aim this study was evaluate effects pigs' ability digest metabolize diet enriched fiber. After 11 wk age, 2 lines divergently selected for (low or high; n = 7 pairs littermates each line) were either control (133 g NDF 9.69 MJ NE/kg) high-fiber (244 8.36 3 wk. Irrespective diet, ADFI water consumption lower (P < 0.001) low line, whereas G:F over test period 16% greater that line compared with high line. There no line-associated digestibility nutrients energy, despite lighter digestive tract (-6.4%, P 0.04) colon weight (-8.6%, 0.03) than As reduced (-7.5%, both when but ADG lowered only 0.05). decreased 0.01) values energy similarly lines. However, it increased ratio acetate propionate concentrations distal part gastrointestinal 0.07). pattern response plasma metabolites hormones meal altered by selection, not affected increase glucose concentration after ingestion more pronounced 0.05) long-lasting lactate tended be 0.10) Plasma NEFA activity levels catabolic enzymes muscle liver did differ diets. In conclusion, seem better utilize This associated marked changes digestion, underlying metabolic mechanisms remain clarified.